| 75 | × | 27 2 | = | ( | 27 2 | − | x | ) | ( | 82 | − | x | ) |
| 方程左边 = | 2025 2 |
2025 2 | = | ( | 27 2 | − | x | ) | ( | 82 | − | x | ) |
| 方程右边 = | 27 2 | ( | 82 | − | x | ) | − | x | ( | 82 | − | x | ) |
| = | 27 2 | × | 82 | − | 27 2 | x | − | x | ( | 82 | − | x | ) |
| = | 1107 | − | 27 2 | x | − | x | ( | 82 | − | x | ) |
| = | 1107 | − | 27 2 | x | − | x | × | 82 | + | x | x |
| = | 1107 | − | 191 2 | x | + | x | x |
2025 2 | = | 1107 | − | 191 2 | x | + | x | x |
| x2= | 189 2 |